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   1 /**
   2  * Copyright (c) 2010-2022 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.minecraft.internal.discovery;
  14
  15 import java.util.Collections;
  16 import java.util.HashMap;
  17 import java.util.Map;
  18
  19 import org.openhab.binding.minecraft.internal.MinecraftBindingConstants;
  20 import org.openhab.binding.minecraft.internal.MinecraftHandlerFactory;
  21 import org.openhab.binding.minecraft.internal.config.ServerConfig;
  22 import org.openhab.binding.minecraft.internal.handler.MinecraftServerHandler;
  23 import org.openhab.binding.minecraft.internal.message.data.PlayerData;
  24 import org.openhab.binding.minecraft.internal.message.data.SignData;
  25 import org.openhab.binding.minecraft.internal.server.ServerConnection;
  26 import org.openhab.binding.minecraft.internal.util.Pair;
  27 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  28 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  29 import org.openhab.core.config.discovery.DiscoveryService;
  30 import org.openhab.core.thing.ThingUID;
  31 import org.osgi.service.component.annotations.Component;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 import rx.Observable;
  36 import rx.Subscription;
  37 import rx.functions.Func1;
  38 import rx.schedulers.Schedulers;
  39 import rx.subscriptions.CompositeSubscription;
  40
  41 /**
  42  * Handles discovery of Minecraft server, players and signs.
  43  *
  44  * @author Mattias Markehed - Initial contribution
  45  */
  46 @Component(service = DiscoveryService.class, configurationPid = "discovery.minecraft")
  47 public class MinecraftDiscoveryService extends AbstractDiscoveryService {
  48
  49     private final Logger logger = LoggerFactory.getLogger(MinecraftDiscoveryService.class);
  50
  51     private static final int DISCOVER_TIMEOUT_SECONDS = 60;
  52
  53     private CompositeSubscription subscription;
  54
  55     public MinecraftDiscoveryService() {
  56         super(Collections.singleton(MinecraftBindingConstants.THING_TYPE_SERVER), DISCOVER_TIMEOUT_SECONDS, false);
  57     }
  58
  59     @Override
  60     protected void startScan() {
  61         logger.debug("Starting Minecraft discovery scan");
  62         discoverServers();
  63     }
  64
  65     @Override
  66     protected synchronized void stopScan() {
  67         logger.debug("Stopping Minecraft discovery scan");
  68         stopDiscovery();
  69         super.stopScan();
  70     }
  71
  72     /**
  73      * Start scanning for players and signs on servers.
  74      */
  75     private void discoverServers() {
  76         subscription = new CompositeSubscription();
  77
  78         Observable<ServerConnection> serverRx = serversConnectRx().cache();
  79
  80         Subscription playerSubscription = subscribePlayersRx(serverRx);
  81         Subscription signsSubscription = subscribeSignsRx(serverRx);
  82
  83         subscription.add(playerSubscription);
  84         subscription.add(signsSubscription);
  85     }
  86
  87     /**
  88      * Subscribe for sign updates
  89      *
  90      * @param serverRx server stream
  91      * @return subscription for listening to sign events.
  92      */
  93     private Subscription subscribeSignsRx(Observable<ServerConnection> serverRx) {
  94         return serverRx
  95                 .flatMap(connection -> connection.getSocketHandler().getSignsRx().distinct(), (connection, signs) -> {
  96                     return new Pair<>(connection, signs);
  97                 }).subscribe(conectionSignPair -> {
  98                     for (SignData sign : conectionSignPair.second) {
  99                         submitSignDiscoveryResults(conectionSignPair.first.getThingUID(), sign);
 100                     }
 101                 }, e -> logger.error("Error while scanning for signs", e));
 102     }
 103
 104     /**
 105      * Subscribe to player updates
 106      *
 107      * @param serverRx server stream
 108      * @return subscription for listening to player events.
 109      */
 110     private Subscription subscribePlayersRx(Observable<ServerConnection> serverRx) {
 111         return serverRx
 112                 .flatMap(socketHandler -> socketHandler.getSocketHandler().getPlayersRx().distinct(),
 113                         (connection, players) -> new Pair<>(connection, players))
 114                 .subscribeOn(Schedulers.newThread()).subscribe(conectionPlayerPair -> {
 115                     for (PlayerData player : conectionPlayerPair.second) {
 116                         submitPlayerDiscoveryResults(conectionPlayerPair.first.getThingUID(), player.getName());
 117                     }
 118                 }, e -> logger.error("Error while scanning for players", e));
 119     }
 120
 121     /**
 122      * Teardown subscribers and stop searching for players and signs.
 123      */
 124     private void stopDiscovery() {
 125         if (subscription != null && !subscription.isUnsubscribed()) {
 126             subscription.unsubscribe();
 127         }
 128     }
 129
 130     /**
 131      * Get all servers that have been added as observable.
 132      *
 133      * @return observable emitting server objects.
 134      */
 135     private Observable<ServerConnection> serversConnectRx() {
 136         return Observable.from(MinecraftHandlerFactory.getMinecraftServers())
 137                 .flatMap(new Func1<MinecraftServerHandler, Observable<ServerConnection>>() {
 138                     @Override
 139                     public Observable<ServerConnection> call(MinecraftServerHandler server) {
 140                         ServerConfig config = server.getServerConfig();
 141                         return ServerConnection.create(server.getThing().getUID(), config.getHostname(),
 142                                 config.getPort());
 143                     }
 144                 });
 145     }
 146
 147     /**
 148      * Submit the discovered Devices to the inbox.
 149      *
 150      * @param bridgeUID
 151      * @param name name of the player
 152      */
 153     private void submitPlayerDiscoveryResults(ThingUID bridgeUID, String name) {
 154         String id = deviceNameToId(name);
 155         ThingUID uid = new ThingUID(MinecraftBindingConstants.THING_TYPE_PLAYER, bridgeUID, id);
 156
 157         Map<String, Object> properties = new HashMap<>();
 158         properties.put(MinecraftBindingConstants.PARAMETER_PLAYER_NAME, name);
 159         thingDiscovered(DiscoveryResultBuilder.create(uid).withProperties(properties).withBridge(bridgeUID)
 160                 .withLabel(name).build());
 161     }
 162
 163     /**
 164      * Submit the discovered Signs to the inbox.
 165      *
 166      * @param bridgeUID
 167      * @param sign data describing sign
 168      */
 169     private void submitSignDiscoveryResults(ThingUID bridgeUID, SignData sign) {
 170         String id = deviceNameToId(sign.getName());
 171         ThingUID uid = new ThingUID(MinecraftBindingConstants.THING_TYPE_SIGN, bridgeUID, id);
 172
 173         Map<String, Object> properties = new HashMap<>();
 174         properties.put(MinecraftBindingConstants.PARAMETER_SIGN_NAME, sign.getName());
 175         thingDiscovered(DiscoveryResultBuilder.create(uid).withProperties(properties).withBridge(bridgeUID)
 176                 .withLabel(sign.getName()).build());
 177     }
 178
 179     /**
 180      * Cleanup device name so it can be used as id.
 181      *
 182      * @param name the name of device.
 183      * @return id of device.
 184      */
 185     private String deviceNameToId(String name) {
 186         if (name == null) {
 187             return "";
 188         }
 189         return name.replaceAll("[^a-zA-Z0-9]+", "");
 190     }
 191 }